diff --git a/.gitmodules b/.gitmodules
index 29f7648..be7b01c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -37,6 +37,9 @@
 	path = lib/magit
 	url = git@github.com:magit/magit.git
 	info-path = Documentation
+[submodule "markdown-mode"]
+	path = lib/markdown-mode
+	url = git@github.com:jrblevin/markdown-mode.git
 [submodule "no-littering"]
 	path = lib/no-littering
 	url = git@github.com:emacscollective/no-littering.git
diff --git a/lib/markdown-mode b/lib/markdown-mode
new file mode 160000
index 0000000..cde5c5d
--- /dev/null
+++ b/lib/markdown-mode
@@ -0,0 +1 @@
+Subproject commit cde5c5d2bcce470c494b76e23cfe1364b6291c20